231=13-u

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Solution for 231=13-u equation:


Simplifying
231 = 13 + -1u

Solving
231 = 13 + -1u

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add 'u' to each side of the equation.
231 + u = 13 + -1u + u

Combine like terms: -1u + u = 0
231 + u = 13 + 0
231 + u = 13

Add '-231' to each side of the equation.
231 + -231 + u = 13 + -231

Combine like terms: 231 + -231 = 0
0 + u = 13 + -231
u = 13 + -231

Combine like terms: 13 + -231 = -218
u = -218

Simplifying
u = -218

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